My 35a, though it intersects with the unclued column, is 11 letters long, not 12. Is that correct?
Also, maybe a silly question, but is it safe to assume that unchecked letters are never replaced? If so, it would have helped if the preamble had talked about resolving clashes, rather than simply replacing letters.
Simonsays, following your hint for 9d, I get SCOUTH, but that means free range, scope or plenty.
29d remains a total mystery, despite the hints here. Are we supposed to do 12 minus 8? I've searched for every prickly shrub I can think of.
Finally, is the naval officer in 36a real or fictional?
Thanks and sorry for the long post but it's getting to the point where I can't waste any more time on this.